Soap bar



FIG. 1 is a front, elevational view of a soap bar, showing my new design;

FIG. 2 is a left side, elevatational view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side, elevational view thereof;

FIG. 5 is a rear, elevational view; and

FIG. 6 is a plan view. 

The ornamental design for a soap bar, as shown and described. 